The last time I checked, the Earth was a part OF the universe, not APART from it.
The verse itself becomes confusing by the Muslims argument , but becomes entirely clear when we read the verse in the authentic context..
The Quran simply parrots common beliefs of the time period and nothing more.
The Qurans statement of separating the Earth from the Heavens is nothing new, the concept is found in all surrounding and Earlier religions/Cultures of the region.
Christianity, Judaism, Sumerian Mythology for example, all talk about a separation between the Heavens and he Earth, do they describe the Big Bang? Of course not and no one assumed this to be the case.
The reality of the situation is that the claim creates a belief that the Heavens (now known as the upper sky) and the Earth were separated (as with a brick lifted off the top of another Brick) to simply create a space between them.
All the Quran is doing (a consistent find in the Quran) is giving a vague synopsis of local beliefs which have been incorporated to give the Quran a sense of credibility and nothing more, especially not what some muslims would have you believe.
In conclusion, the Quran does not demonstrate the Big Bang theory and only appeals to archaic beliefs of creation, disproving its 'divinity' .